Stoichiometry Mass and Mole Calculations

Calculate the molar mass of propane (C₃H₈).

• 13 g/mol

• 44 g/mol

• 99 g/mol

How many moles are in 9.8 grams of calcium?

• 0.2 moles

• 4.1 moles

• 1 mole

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield

• mole ratio

• actual yield

• percentage yield

Mole ratios are obtained from the

• coefficients in a balanced chemical equation

• periodic table

• molar mass

Tags

NGSS.HS-PS1-7

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g

• 290 g

• 450 g

• 870 g

How many grams of KCl can be produced from 356 grams KBr?

• 749 g

• 225 g

• 479 g

• 814 g

2Fe₂O₃ + 3C → 4Fe + 3CO₂ After an experiment from this reaction, you collect 81.2 grams of CO₂. However, your stoichiometry calculations show that you could have gotten 102.6g of CO_{2. What is the percent yield of CO2?}

• 58.83%

• 308%

• 6435%

• 79.14%

Tags

NGSS.HS-PS1-7

How many grams of lead II chloride (PbCl₂) are produced from the reaction of 15.3 g of NaCl and 60.8 g of Pb(NO₃)₂?

• 21.5g

• 51.1g

• 43.4g

• 36.4g

SO₂ + PCl₅ --> SOCl₂ + POCl₃ How many grams of SOCl₂ is produced when 16.2g SO₂ react with 13.7g PCl_5? 

• 7.87g

• 30.1g

• 26.4g

• 19.8g 

Tags

NGSS.HS-PS1-7

Identify the limiting and excess reactants in the reaction shown.

• N₂ is limiting and H₂ is excess. 

• H₂ is limiting and N₂ is excess. 

• NH₃ is both limiting and excess.

• There is no limiting reactant. 

Tags

NGSS.HS-PS1-7